Fusible link.



No. 811,256. PATENTBD JAN. 30, 1906. A. W. STREY. PUSIBLE LINK.

APPLIUATION FILED MA1/12, 1905.

to prevent the solder 3 being drawn out of the ollowing is a s 'eciiicatiom vention re ates'to an lmproved fusi- 1o.

UNiTED- STATES PATE-NT oEEioE. ANDREW WILLIAM s TOREnoF MosroNiiEAn MANCHESTER, ENGLAND.

l FuslBLE LINK.

No. einem,

:specification of Letters Patent'.

Patented Jan. so, ieee.

` -Appiitiaon'fiid M a'y 12,1905. serial No. 260,125.

f' Moston, near Manchester, in .thecounty of Lancaster England, have invented a new and, use 4Improved Fusible Link, of which blei link applicable for certain -forms-of-automaticv reextinguishing sprinklers, for fire- *prodoora and for other similar purposes;

1 and the. chief object of .my improvements is Qwarol drilled out; sc as to leave athin lining tgjprotect the sensitive solder of theiusible against oxidation.

In ca 'ng my inventioninto effect I form the fusib elink in two parts connected together by a screwjoint. 'One partconsists of a smal1- cylinder; formed of a suitable lled with sensitive solder, which is after-` of solder, in which a screw-thread is then cut. The second part. of the .link consists of a smallplu .screw-'threaded to correspond with the t ead the cylinder.

In the accompanying sheet of drawings,

' ligure 1 aside elevation, and Fig. 2 an end elevation, of my roved fusible link; and Fig. 3 is a longitn al vertical section of Fig.vv 1. Fig. 4 is -a front elevation, Fig. 5 a side elevation, and Fig. 6a plan, of an auto- -matic.`'iii'e-eXtinguishing `sprinkler with my improved-fusiblelinkapplied thereto. Figs.

7, 8, andiQ'are similar views to Figs. 4, 5, andv 6, respectively, of another construction of "automatic sprinkler sealed by two of my irnj proved'usible Referring first toFigs. 1, 2, and 3, 1 denotes' a c lmdei' forming the irst part, and 2 the small7 screwthreaded plu -oriningthe second part," of my improve fusible link. The art 1 is formed of suitable metal and is lille with sensitive. solder, which is then drilled out, so as .to leave a thinlinin 3 of the solder, in which a 'screw-'thread-is then cutcorresponding with thethread on the plug 2. The parts 1 and 2fare coupled up by screwngthe plug 2 into the cylinder 1, as shown. T'iny convenient device is adopted the cylinder 1 rangement of levers, also for ho metal, preferably copper or brass, and then For example, asshwn in 111g.

3, the cylinder is of largest diameter at its closed end and gradually tapers toitssmalhj est diameter atv its open end.

55 The iniprovedfusible link is applicable to certain I.forms vof automatic sprinklers in which a= valve .s held to its seatin by an-ar-l Iding back frep'roof doors and -ior like which 'increase ofheat resulting from fire W1ll melt the sensitive solder contained in the c lindrical part of thelink, and thus allow t e parts to separate under the strain or weight upon them. In' Figs. 4 to 9 inclusive, I show two forms of automatic sprinklers toillustrate the a plication of my improved-fusible link. iii the first arrangernent, Figs. 4 to 6, the link a; is shown confining the extremities of two levers b b, which when-in the position shown in,

purposes, in 6o the drawings hold the -valve c to its seating inf the usual way. On anoutloreak of iire the fusion of the sensitive solder in the.link will- `break the screw-joint and allow the parts to separate and the'sprinkler to open. In the second arrangement, Figs. 7 to 9', two of the.- links a are employed to conine a spring-piece f and hold the valve c to its seating.

Having now particularly described and ascertaine A'usible link com rising two parts, one

-consisting of a cylin e1` 1 havin ata )ered the'natiire of my said invention vand in what manner the same is to be pei:-

interior, asensitive solder lining or sai c yl-t.

inder having its exterior ta ered and having a screw-threaded bore an the other part` consisting of a' screw-threaded plug ttingthe threaded lining, said second part having a Erojecting portion closing the end ofthe CY nder so' as to completelycover the sensi#- tive solder.

In testimony whereof have signediny name to this specification in the presence of two subscribin witnesses.

ANDR W WILLIAM S'EOREY.-* -Witnessesz H. B. BAnLow,

HERBERT ROWLAND ABBEY. 

